SHAPE MEMORIZING POLYMER FOAM

摘要

PURPOSE:To obtain the title foam having raised rate of shape recovery and excellent recovery action properties, taking a deformed shape prepared by compressing and deforming a foam at >= glass transition temperature and solidifying the foam at <= the transition point and a molded shape prepared by heating the deformed shape to restore the deformed shape into an initial shape. CONSTITUTION:The aimed foam can take a deformed shape prepared by compressing and deforming foam at >= glass transition point of polymer and then solidifying the foam at >= the glass transition point of polymer and a molded shape prepared by reheating the deformed shape at >= the glass transition point of polymer to restore the deformed shape into an initial shape. The aimed foam is a polyurethane foam obtained by blending a bifunctional diisocyanate with a bifunctional polyol and an active hydrogen group containing bifunctional chain extender in the molar ratio of (2.00-1.10):1.00:(1.00-0.10), adding a blowing agent to the blend and synthesizing by prepolymer method. The foam contains almost equivalent [NCO] and [OH] at the end of the polymer and has -50-60 deg.C glass transition point and 3-50wt.% crystallinity.